Archived from groups: alt.internet.wireless (
More info?)
In article <32eivoF3k1mj1U1@individual.net>,
Oliver Gunnell <Oliver.spamGunnell@dsl.pipex.com> wrote:
: A hotel need a plasma display showing content from a pc but
:they don't wont us to run cables from a pc which is the best way of course,
: So we are thinking of using a OTC Wireless Data 802.11g adapter to send
:content playing on pc
:which will be Flash files of different animations to the plasma, anybody
:ever done this?, and will it play smothly
Doable in theory, if not with that exact equipment then with some
other, especially if the display signal itself is digital. With
analog you have to worry about phase changes, colour shifts,
and probably other things I'm forgetting.
:But also the Hotel already has a Wireless network for the guests laptops
:Can we run two together?, We cant change the current AP so any changes
:have to be done to our setup
Yes, you should be able to do that. If the existing network is
11b or 11g then you'd be best off running an 11a connection to
the display, but that's not a strict necessity. Multiple networks
can exist in the same place. Best is if they do not use overlapping
channels. 11g provides for 3 channels, each of which overlaps several
11b channels. If you do end up using a channel that is in use by
something else, the effect will be to reduce the maximum effective
transmission rate you can use, either through interference corrupting
the bits, or through the AP's noticing each other's existance and
using flow control to regulate who talks at any one time.
If the hotel's guest wireless network permits 11b connections
(and it very likely does, as it would not want to insist that guests
use 11g equipment they might not own), then if the frequencies
overlap the ones you are using for the plasma display, the
reduction in maximum transmission rate is about 1/3 -- that is,
if there are nearby 11b devices in the same frequency
bands, then even if the devices aren't talking much, you will only
be able to get about 2/3 of the transmission rate that you would if
the 11b devices weren't there at all. So you really want to avoid
overlap with the hotel network if possible. Then you run into the
problem that the guests are going to be running wireless networks
between themselves, and those are going to interfere.... That is
why 11a is a much better choice for your purposes than 11g:
relatively few guests will be using 11a devices amongst themselves,
and 11a channels do not overlap with each other at all.
:Would it be better to run the plasma and pc in adhoc mode or as a 2nd AP?
Infrastructure mode, not adhoc, I would say.
I would further suggest that you use directional antenna, not omni.
The more directional the better -- not for signal strength reasons,
but to decrease the interference of random other wireless signals around.
A carefully aimed sector antenna might do the trick -- particularily
if you can put in reflectors to block the beam from travelling onward
indefinitely.
:This will be playing 24hrs so I need to make sure these two networks are not
:going to crash each other,
You should start thinking about the security mechanism you are
going to use. If you use WEP then a bored guest who was going to be
around for a few hours or days could find your WEP key and then
would be able to change the sign to read things you'd rather not have
appear...
--
'ignorandus (Latin): "deserving not to be known"'
-- Journal of Self-Referentialism
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